Abaqus Interaction

Abaqus Interaction Skill

Define contact pairs, tie constraints, coupling, and connectors between parts in an assembly.

When to Use This Skill

Route here when user mentions:

• "Contact between surfaces"
• "Friction", "sliding contact", "frictionless"
• "Tie constraint", "bonded surfaces", "welded"
• "Parts touching", "parts can separate"
• "Coupling", "connector", "spring element"
• "Join different meshes"

Route elsewhere:

• Complete contact analysis workflow → /abaqus-contact-analysis
• Fixed supports or displacements → /abaqus-bc
• Applied forces or pressures → /abaqus-load

Key Decisions

1. What Type of Connection?

2. Contact Formulation

3. Typical Friction Coefficients

What to Ask User

If unclear, ask:

1. Bonded or sliding?

   • Bonded (no relative motion) → Tie constraint
   • Sliding allowed → Contact with friction

2. Friction coefficient?

   • If not specified, suggest typical value for material pair
   • Frictionless is valid for lubricated or normal-dominant cases

3. Which surface is master/slave?

   • User may not know - guide them (see below)

4. Can surfaces separate?

   • Yes → allowSeparation=ON
   • No (always in contact) → allowSeparation=OFF

Master/Slave Selection Guidelines

When in doubt: The coarser mesh should be master.

Workflow: Setting Up Interactions

Step 1: Identify Contact Pairs

List all surfaces that interact. For each pair determine:

• Type (contact vs tie)
• Master and slave assignment
• Friction requirements

Step 2: Create Surfaces

Surfaces must be defined on assembly instances before creating interactions.

Step 3: Define Contact Properties

For contact interactions, define:

• Normal behavior: Hard contact, allow separation
• Tangential behavior: Friction formulation and coefficient

Step 4: Create Interaction

Assign contact property to surface pair in appropriate step.

Step 5: Verify Setup

Check for:

• Correct master/slave assignment
• Appropriate initial gap/overclosure
• Contact pair is active in correct step

Common Gotchas

Validation Checklist

Before running analysis:

• All contacting surface pairs identified
• Master/slave correctly assigned
• Contact properties defined (normal + tangential)
• Interaction assigned to correct step
• Initial gaps/overclosures within tolerance
• Friction coefficient appropriate for materials

Code Patterns

For API syntax and code examples, see:

• API Quick Reference
• Common Patterns
• Troubleshooting Guide